Ultrasound-Assisted Flotation of Low-Rank Coal: A Review of the Current Status

BU Xiangning; CHEN Yuran; NI Chao; XIE Guangyuan

doi:10.13779/j.cnki.issn1001-0076.2022.01.014

2022 Vol. 42, No. 1

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Article navigation > Conservation and Utilization of Mineral Resources > 2022 > 42(1): 97-105

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BU Xiangning, CHEN Yuran, NI Chao, XIE Guangyuan. Ultrasound-Assisted Flotation of Low-Rank Coal: A Review of the Current Status[J]. Conservation and Utilization of Mineral Resources, 2022, 42(1): 97-105. doi: 10.13779/j.cnki.issn1001-0076.2022.01.014

Citation:

BU Xiangning, CHEN Yuran, NI Chao, XIE Guangyuan. Ultrasound-Assisted Flotation of Low-Rank Coal: A Review of the Current Status[J]. Conservation and Utilization of Mineral Resources, 2022, 42(1): 97-105. doi: 10.13779/j.cnki.issn1001-0076.2022.01.014

Ultrasound-Assisted Flotation of Low-Rank Coal: A Review of the Current Status

1.
Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining &Technology, Xuzhou 221116, China
2.
School of Chemical Engineering and Technology, China University of Mining &Technology, Xuzhou 221116, China
3.
School of Material Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

More Information

Corresponding author: CHEN Yuran, cyr_hy@zzu.edu.cn

Received Date: 11 November 2022

Publish Date: 25 February 2022

Abstract

Abstract

Low-rank coal has developed surface pores and high content of oxygen-containing functional groups, resulting in unsatisfactory conventional flotation results. Numerous studies demonstrated that ultrasound is a commonly used enhancement method for coal flotation. This article first introduces the theory of ultrasonic cavitation (cavitation threshold, transient and steady-state cavitation) and acoustic radiation force (primary and secondary). Then, the research status of ultrasound-assisted flotation of low-rank coal is reviewed from 4 aspects: particle breakage, removal of the surface coating, modification of surface properties, emulsification and dispersion of flotation collectors, micro-nano-bubble effect, and the changes of flotation bubble size and foam layer changes. Finally, the development direction of the research on ultrasonic-enhanced low-rank coal flotation is prospected. It is suggested that the mechanism of ultrasound-assisted flotation of low-rank coal should be further studied from four aspects: the enhancement of steady-state cavitation on the surface hydrophobicity of low-rank coal, the formation of flocs between low-rank coal particle and cavitation bubbles induced by acoustic radiation force, the enhancement of transient cavitation on the collection performance of flotation reagents, the enhancement of bubble coalescence and the inhabit of gangue entrainment induced by acoustic radiation force.
- ultrasound /
- low-rank coal /
- flotation /
- cavitation theory /
- acoustic radiation force

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References

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